Make sure read hasn't failed before updating position. #49158
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I noticed this when I was yoinking the code for my own project. When `read()` fails and `errno` is `EINTR`, it re-reads from the wrong position.
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I noticed this when I was yoinking the code for my own project. When `read()` fails and `errno` is `EINTR`, it re-reads from the wrong position.
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I noticed this when I was yoinking the code for my own project. When
read()fails anderrnoisEINTR, it re-reads from the wrong position.